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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aad61a105486a92a4bed279b1518828ac81bc659062e838283bc0b86930d128' 
  AND token = 'mY9zkAJ0bsEOHtILtcOunTDJgVZrk5f61e4h79sL8I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}